It is very important that you register your domain on different dates and on different registrars because registering a domain on the same date can be a big footprint and it can be avoided easily, this is also good practice to help prevent Private Blog Network detection. Try to register a domain by giving one week gap.

While it's true that some CDNs, like Cloudflare, hide your hosts IP from the average user, Google is not your average user.

Google is a Domain Name Registrar with access to ALL of ICANN's records of every domain name and its registrar. Google can see all this and even information that is not obvious. Your best bet is really to register with different domains.